A serious discussion of what jihad means has to start with the Qur'an, and end with the actual practices of the worldwide population of 1 billion muslims. I've already discussed it in a Qur'anic context. And as for the actual practice, I assure any doubters that they'd notice 1 billion people engaging in armed warfare against non-Muslims by virtue of their being non-Muslims. Perhaps Lewis' definitions of "minority" and "majority" differ from mine.